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Applied Optics

Applied Optics


  • Editor: Joseph N. Mait
  • Vol. 51, Iss. 15 — May. 20, 2012
  • pp: 2958–2967

High-precision three-dimensional shape reconstruction via digital refocusing in multi-wavelength digital holography

Li Xu, Carl C. Aleksoff, and Jun Ni  »View Author Affiliations

Applied Optics, Vol. 51, Issue 15, pp. 2958-2967 (2012)

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Three-dimensional (3D) shape reconstructions and metrology measurements are often limited by depth-of-field constraints. Current focus-detection-based techniques are insufficient to profile out-of-focus 3D objects with high axial accuracy. Extended-focus imaging (EFI) techniques can improve the range and precision of such measurements. By incorporating digital refocusing with multiwavelength interferometry, a holographic imaging solution is presented in this paper to accurately measure 3D objects over a large depth range. Accuracy and repeatability of the proposed EFI technique are validated by digital simulations and refocusing experiments. A reconstruction example demonstrates the feasibility of high-precision 3D measurements of objects deeper than the system’s classical depth of field.

© 2012 Optical Society of America

OCIS Codes
(090.2880) Holography : Holographic interferometry
(120.3940) Instrumentation, measurement, and metrology : Metrology
(090.1995) Holography : Digital holography

ToC Category:

Original Manuscript: September 23, 2011
Revised Manuscript: December 14, 2011
Manuscript Accepted: December 15, 2011
Published: May 18, 2012

Li Xu, Carl C. Aleksoff, and Jun Ni, "High-precision three-dimensional shape reconstruction via digital refocusing in multi-wavelength digital holography," Appl. Opt. 51, 2958-2967 (2012)

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